Machine for bending stereotype-matrices.



C. W. F|NGER.'

MACHINE FOR BENDlNG-STEREOTYPE MATRICES.

APPLICATION FILED ocT. 2h I915.

Elma/ido (3km MK Rhmgw. v FW WL WOW Asl-nNu'rofi. D. C.

Patented Apr. 4, 1916.

. pockets in the frame, and these springs rest ran srxrnsf Parana orrion.

CHARLES W. FINGER, 0F DETROIT, MICHIGAN,IASSIGNO R OF ONE-HALF 1'0 CHARLES R.

V MUELLER, J R OF DETROIT, MICHIGAN.

MACHINE ron BENDING;s'rEREo'rYrnMArmcns.

Specificationof Letters Patent. Y Patented APIZ4, 1916- Application filed October 21, 1915. Serial No. 57,050.

To all whom it may concern Be it known that 1, CHARLES or tubular form so that it can be readily inserted into the stereotype casting machine,

and the object of the invention is to provide a machine which shall bend the matrix evenly throughout its width, thus avoiding the breaking orcracking of the faceof the matrix and the loosening of the packing usually employed to support high spots.

After the type havebeen set and locked into fiat forms, sheets of moist matrix paper are placed over the type and pressed down against them, usually by means of a proper roller. to harden them and to fix the impressions. The matrices must next be bent to cylind'ri cal form so that cylindrical sleeves of stereotype metal may be cast, which castings are then machined to fit the cylinders of the presses. These matrices are usually bent by hand, often by pulling them across an edge of a work bench, which results in numerous breaks or cracks with unevenly bent portions of the matrix between them. This results in the exterior surface of the stereotype cylinders being slightly uneven and results in uneven printing.

In the accompanying drawing Figure 1 is a rear elevation and Fig.2 is a side elevation of a machine embodying my invention. Fig. 3 is a detail of the driving clutch.

Similar reference characters refer to likeparts throughout the several views.

The machine shown in the drawing has: two sides 1 and 2 of a frame, formed withbearings 3 for the shaft 4 0f the upper roll 5, and with slots 6 for the bearings 7 of the shaft 8 of the lower roll 9. The bearings 7 rest on coil springs 10 mounted in proper on small plates 12 supported by adjusting screws 13.

The upper roll is generally in the form of a spiral to avoid the jog or offset that would occur at the line where the matrix overlaps, and adjacent the shoulder 1 1 arev secured two sheets 15 and 16 of strong, tough elastic W. FINGER, a citizen of the United States, residing at The sheets are then baked in order material such as rubber cloth or pulp board, two sheets 17 and 18 of thin flexible sheet metal, and a small spacing strip 19 which acts as a stop or gage for the end of the matrix, all secured in positionby screws 20. A'table 21 of any desired construction may be connected to the frame;

The upperroll is turned by means of the crank .22. In order .torpreventfireverse rotation of this roll by means of the crank when a matrix is between the rolls, a roller clutch of any well known construction is installed 'between'the crank 22 and a collar 23 secured on the shaft'. This collar has the usual notches 24 that receive the short rollers or balls 25, the sleeve 26 on'the crank serving as the other member of the clutch. A collar 27 on the shaft 4: prevents the crank from slipping off the end of the shaft.

'When a matrix 29 is to be bent, the pad 15 wound onto. this roller, the lower roller 9 being tightly pressed against the matrix to insure even engagementand'bending, After the matrix has been entirely wound on the roller, it is pulled back, turning-the rollers in the reverse direction, until the parts are againas shown in Fig. 2. It willbe understood that the roller 5 is preferably of less diameter than theinterior diameter of the finished stereotype sleeve.

The advantage of the four sheets 15, 16, 17 and 18 is as follows: By having sheets of metal in direct contact with the matrix, any narrow grooves or other depressions in either side ofthe matrix will be bridged so that the matrix virtually becomes a sheet which will cause the sheet metal to bulge atthese points. The softer pads between these metal sheets and the rollers may be com pressed slightly more by such increases in thickness of the materials between them,

. c and sheet 17 of metal are laid back over'the While at the same time transfer to the remainder of the sheet suflicient pressure to cause it to bend evenly.

The side frames 1 and 2 may be spaced by means of sleeves 31 and held together by means of bolts Brackets 33 and 3% on the frame may be formed with slots 35 to receive the bearings 36 of the shaft 37 of the auxiliary pressure roller 38. This roller smaller in diameter than the roller 9 and greatly assists in the proper bending of the matrix. It is held against the roller 5 by means of the springs 39 that are properly tensioned by means of the screws 40 and the small plates 41. the thickness of the webs 15 and 16, the sheets 17 and 18 and the spacing strip 19 is the same as the height of the shoulder is so that there will be no sudden shocks at the edge of this shoulder as the rollers 9 and 38 pass over it.

It has beerl' found that the roll 5 should be smaller in diameter than the roll on which the sleeve of stereotype metal is to be mounted.

I claim v 1. In a machine for bending stereotype matrices, the combination of a pair of rolls, one above the other, bearings for said rolls, means to press the rolls against each other, the lower roll being cylindrical and the upper being substantially spiral in cross section and thus formed with a longitudinal shoulder, and retaining devices for the matrix secured to said upper roll and consist ing of two sheets of rubber cloth and two thin sheets of metal between them.

2. In a machine for bending stereotype matrices, the combination of a frame, a roll mounted in said frame and formed with a longitudinal shoulder, the surface of said roller being of substantially uniform curvature from the top around to the bottom of said shoulder, retaining devices for the matrix secured to said roll and consisting of two sheets of flexible elastic material and two thin sheets of metal between them, means to hold the metal sheet-s separated at the line of attachment to the roll, a second roll mounted in the frame, means to press said rolls against each other, and means to turn the rolls.

3. In a machine for bending stereotype it will be understood that matrices, the combination of a frame, three rolls journaled therein, means to press two of the rolls against the third, matrix-retaining means secured to the third roll consist ing-of two sheets of compressible material and two sheets of incompressible n aterial between them, the matrix being placed between the sheets of incompressible material and wound upon the roll to which said sheets are attached, and means to revolve said rolls.

5. In a machine for bending stereotype matrices, the combination of a frame, a pair of rolls journaled therein, means to press one of the rolls against the other, matrix retaining means secured to one of the rolls consisting of two sheets of compressible material and two sheets of incompressible material between them the matrix being placed between the sheets of incontipressible material and wound upon the roll to which said sheets are attached, a crank, and a clutch between the handle and one of t le rolls whereby the crank may turn the rolls when turned in one direction but will be inefiective when turned in the other direction.

6. In a machine for bending stereotype matrices, the combination of a pair of rolls, bearings for said rolls, means to press the rolls against each other, and retaining vices for the matrix secured to one of the rolls and consisting of two sheets of elastic material and two thin sheets or metal bc tween them.

In testimony whereof I sign this specification.

CHARLES W. FINGER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 01 Eatents, Washington, D. C. 

